Robustify SourceManager::getLocation(), so that it returns an

end-of-line source location when given a column number beyond the
length of the line, or an end-of-file source location when given a
line number beyond the length of the file. Previously, we would return
an invalid location.

llvm-svn: 97299

1 files changed, 18 insertions, 14 deletions

diff --git a/clang/lib/Basic/SourceManager.cpp b/clang/lib/Basic/SourceManager.cpp
index b91671ad17b..0c22de7bddb 100644
--- a/clang/lib/Basic/SourceManager.cpp
+++ b/clang/lib/Basic/SourceManager.cpp
@@ -980,20 +980,6 @@ SourceLocation SourceManager::getLocation(const FileEntry *SourceFile,
   if (Content->SourceLineCache == 0)
     ComputeLineNumbers(Content, ContentCacheAlloc);
 
-  if (Line > Content->NumLines)
-    return SourceLocation();
-
-  unsigned FilePos = Content->SourceLineCache[Line - 1];
-  const char *Buf = Content->getBuffer()->getBufferStart() + FilePos;
-  unsigned BufLength = Content->getBuffer()->getBufferEnd() - Buf;
-  unsigned i = 0;
-
-  // Check that the given column is valid.
-  while (i < BufLength-1 && i < Col-1 && Buf[i] != '\n' && Buf[i] != '\r')
-    ++i;
-  if (i < Col-1)
-    return SourceLocation();
-
   // Find the first file ID that corresponds to the given file.
   FileID FirstFID;
 
@@ -1020,6 +1006,24 @@ SourceLocation SourceManager::getLocation(const FileEntry *SourceFile,
   if (FirstFID.isInvalid())
     return SourceLocation();
 
+  if (Line > Content->NumLines) {
+    unsigned Size = Content->getBuffer()->getBufferSize();
+    if (Size > 0)
+      --Size;
+    return getLocForStartOfFile(FirstFID).getFileLocWithOffset(Size);
+  }
+
+  unsigned FilePos = Content->SourceLineCache[Line - 1];
+  const char *Buf = Content->getBuffer()->getBufferStart() + FilePos;
+  unsigned BufLength = Content->getBuffer()->getBufferEnd() - Buf;
+  unsigned i = 0;
+
+  // Check that the given column is valid.
+  while (i < BufLength-1 && i < Col-1 && Buf[i] != '\n' && Buf[i] != '\r')
+    ++i;
+  if (i < Col-1)
+    return getLocForStartOfFile(FirstFID).getFileLocWithOffset(FilePos + i);
+
   return getLocForStartOfFile(FirstFID).getFileLocWithOffset(FilePos + Col - 1);
 }